Have had a Wattson for some time now and is also connected to our PV. Works reasonably well although not that infrequently goes "off the rails" and shows we are using a lot of energy when we are using our least or actually feeding power into the grid.
A power cycle is required on the transmitter in the switchboard and then all is OK.
Also the Holmes software requires some fixes to add kWhr costs for renewables. The charging time scales are not able to cope with multi daily tarrifs and off-peak over the weekend. As I am not using it to track costs I am not so concerned.




